Pipe bend



Mw* 29, w34., G. DQMINA LQAEE PIPE BEND Filed Aug. 5. 1932 INVENTOR Geary 50272222@ Patented May 29, 1934 UNITED STATES PIPE BEND Georg Domina, Berlin, Germany, assignor to Cement-Gun Company, Inc., a corporation of New York Application August 3, 1932, Serial No. 627,332 In Germany September 4, 1931 4 Claims.

The present invention relates more particularly to pipe bends for use in pipe lines for transporting abrasive material, as, for example, in back K filling operations in mines in which waste mate- 5 rial is carried back to replace the valuable material, such as coal, which has been removed. The Waste material may be carried through the pipe lines by a current of fluid, preferably air, which not only carries it through the pipe but packs it rmly into its final position to prevent settling of the ground above the backfilled portion of the mine.

In pneumatic backfilling operations the material is forced through the pipe lines and deposited at the desired points and, where high pressure systems are used, the material is packed so tightly that it will be compressed but slightly V'when a load is putthereon. The material passing through the pipe lines Will tend to have an 2'0 abrasive action thereon, particularly at the bends where the material tends to strike the outer side of the bend with considerable force, and this is particularly true where high pneumatic pressures are used and the material is driven through the pipes at high speed. High pressure systems are, however, particularly advantageous in that the material is packed much tighter and much larger pieces of material can be handled than with low pressure systems.

An important object of the present invention is to provide a device adapted to meet the requirements of service in such high pressure and other systems. Another object is to provide a new and improved pipe section containing interchangeable lining members. A further object is to provide a novel device of the character described which will be eihcient in action, simple in construction and economical to manufacture.

According to a preferred embodiment of the invention, use is made, at the place where the tendency to abrasion and shock is greatest, of interchangeable lining members which at one face complete the inner surface of the pipe and at the other or -outer face are provided with projections which determine the distance between the lining members and an outer support which closes the pipe at that side. Preferably the projections or spacers are in the form of transverse ribs at the middle of the lining members. The pipe at the bend is shaped to receive the lining members and is provided with an opening through which the lining members may be inserted and removed, said opening being closed during use of the pipe by a suitable cover removably held in position. The cover may extend Cil along the entire length of the section where the spacers are located, in which case the liners may be inserted and removed directly, or may extend only part way along this section, in which case only part of the liners may be inserted and removed directly and the rest of them must be shifted in one direction into position longitudinally of the pipe to position them properly during insertion and in the opposite direction for removal. During use the waste material tends to work through the openings or interstices at the edges of the liners and fill the open chambers at the back thereof to exert a cushioning or shock absorbing action on the plates or liners. In the event that the liners are worn through, the holes thus formed do not interfere with eicient action in that the shock will be absorbed and wear prevented by lling the hollow chambers at the back of the liners or lining plates.

Other objects and advantages will appear upon consideration of the following description and of the drawing, in which Fig. 1 is a longitudinal section of a pipe bend embodying a preferred form of the invention; and

Fig. 2 is a section taken along theline 2 2 of Fig. 1.

Referring to the drawing, 10 designates a pipe bend having at its ends suitable means, such as flanges 11, whereby the pipe bend may be secured to pipe lengths (not shown). The outer side of the pipe bend receives the impact of the abrasive material carried through the pipe bend by a current of fluid, such as air. The abrasive material may contain pieces of considerable size which will strike against the outer side of the bend. It will be evident therefore that, if an ordinary pipe bend were used the outer side thereof, would be destroyed much sooner than the rest of the pipe bend and necessitate replacing of the whole pipe bend. l

It is desirable therefore to provide a pipe bend with provisions for shock absorbing and with the outer side replaceable thus avoiding complete change of the pipe bend at frequent intervals. To this end, the pipe bend at the part where the greatest wear and stress occur may be formed with an inner portion having a substantially semi-circular cross-section provided at its edges with shoulders 12 for engagement by the corre- 105 spondingedges of a plurality of curved platesor members 13 adapted to complete the pipe proper of the pipe bend. The plates or members 13 may be held against the shoulders 12 in any suitable manner. Preferably, as shown in the drawing,

each plate 13 is provided at its outer face with a projection, here shown as a curved rib 14 intermediate the ends of the plate, which is supported by the outer side of a projection or casing 15 formed integral with the inner portion of the pipe bend and adapted to receive the plates 12 and ribs. 14;` and hold the plates in position.

In order to permit insertion and removal of the plates 13, the projection 15 at the outer side of the pipe bend is provided with an opening between parallel side walls 16 so that the plates 13 can be inserted and removed at'. thisV point. The plates 13, which are normally lo,- cated beyond the ends ofthe opening, mustv be inserted therethrough and slid along through corresponding parts of the projection 15 until they reach their nal positions. The ribs 14 at the outer side of the plates 13 are inposition to engage the outer wall of the casing, with the exception of the plate or plates opposite said opening, which plates arel heldin position by a cover l.`7= which; maybe considered. asaremovable portion. of the outer. sideof the` casing. 15. Said cover.I is preferably so shaped as to engageV the edges around.v said opening and to fit around the curved. ribs.1.4,.and removably held inposition by boltsy 18. pivoted on ears 19 on theV sidewalls of the.- projection so as to swing into and out of slots 20 inthe edgesof the-cover l'?. Threaded on the free endso the bolts 18 are wing nutsy 21 which maybe: tightened to hold the cover in place as indicated` inI Fig. 2 ormay be loosened to permit the bolts: tov be-swung outwardly and release the cover;

It` will beevident (Fig. 1.) that with the arrangement describedthe plates 13 will be-shorter attheir'side-edges-thanat said side middles so as to:- bee wedge-shaped With the base of the wedges at their edges which rest on they shoulders 12. Furthermore the plates 13 will to a certain extent be resiliently supported so as to absorb.v shocks. In use the finer particles of material will tend to work throughthe interstices or openings around the. plates 13` and eventually fill the chamber at the back of these plates, thus producing an additional cushioning and shock absorbing action. When after considerable use a plate 13 isworn through and'. a` hol'ei suchr as22 formed thereiny it isnot necessary to replace this plate immediately inasmuchas the back filling material-.23 will merely buildup to the inner surface of the corresponding plate and will assist the shock absorbing actionrather than detract therefrom. In` some cases Wherel the bendl is very slight the portion containing the replaceable-plates 15- may besubstantially straight and: at. the discharge end of the bend. In these cases the bend proper maybe made up of a short piece of pipe with flanges,v at its ends and inclined tor each other so asto-form a Wedgeshapedz pipeY section. It will alsov be understood that in some cases the cover 17 may extend the whole length. of the part containing the plates and; that in other cases more than. one cover may be used..

It should. ber understood that various changes may be made in the construction and arrange-r ment of parts and that various features may be used without others without departing from the true spirit and scope of the invention..

Having thus described my invention, I claim:

l. The combination of a pipe section forming part of a pipe bend andhaving an open side and a casing integral with said pipe section and enclosing said open side, and a plurality of removable liners in said casing substantially completing the interior surface of the pipe section, each of said liners including a plate of substantial uniform thickness. curved both longitudinally and transversely to. complete the interior of the pipe and a transverse rib projecting from the outer side of said plate and extending substantially completely across the same for engagement with the inner surface of and support by said casing.

2. The combination of a pipe section forming part of a pipe bend. and havingan. openxsidefand a casing having sides integrali with the; sides` of said pipe section but spaced outwardly therefrom to formv shoulders at the edges of the sideso said pipe section, and a pluralityY of removable liners in said casingV substantially completing the. in:- terior surface of the pipe section, each of said liners includingr a curved. plate' to engage saidl shoulders; and complete theinteriorl of the pipe and a transverse rib. at the outer sideof" said,

plate for engagement with thev inner'surface of support by said casing, said casing havingv an opening opposite said pipe section to permit insertion and removal of said liners, a. cover for said opening and means for' fasteningthe cover over said openingand holding saidliners'vin posi tion with.v respect to said pipe sections;

3. The combinationv of a pipe section; forming part of a pipe. bend and; havingy an open side and a `casing integral with said pipe sectionv and. enclosing. said open side', and a plurality of re movable liners in said casing substantially. com-.- pleting; the interior surface of the pipe section, each ofsaid liners including. a plate.- curved transversely and. longitudinally to complete the in terior of the pipe. and a transverse rib=projecting from the outer side of. said plate intermediate its. ends ior. engagement with the inner surface of and support by said casing.

4'.. The combination. with a pipebend: hav-ing its` outer side; open for a: predetermined length providing at each si'deof.' said open: sideflongitudinally extendingA shoulders and having acasing integral with. said pipe bend; outsider ofsaid shoulders and extending across said opeir side,

'and a plurality of. interchangeableresilient liners,

each of saidv liners: includingav curved plate of substantially uniform. thickness adapted. to, rest on said shoulders and. complete the inner surface of. the pipe bend at that point and a central transverse rib. at its outer side adapted to engage the inner surface ci said casing and besupported thereby;

GEORG DOMINA..

ipso 

